<?php
namespace page;
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: zhangyajun <448901948@qq.com>
// +----------------------------------------------------------------------

use think\Paginator;

class Page extends Paginator
{

    //首页
    protected function home() {
//      if ($this->currentPage() > 1) {
//          return "<a href='" . $this->url(1) . "' title='首页'>首页</a>";
//      } else {
//          return "<p>首页</p>";
//      }
    }

    //上一页
    protected function prev() {
        if ($this->currentPage() > 1) {
            return "<a href='" . $this->url($this->currentPage - 1) . "' title='上一页'><</a>";
        } else {
            return "<p><</p>";
        }
    }

    //下一页
    protected function next() {
        if ($this->hasMore) {
            return "<a href='" . $this->url($this->currentPage + 1) . "' title='下一页'>></a>";
        } else {
            return"<p>></p>";
        }
    }

    //尾页
    protected function last() {
//      if ($this->hasMore) {
//          return "<a href='" . $this->url($this->lastPage) . "' title='尾页'>尾页</a>";
//      } else {
//          return "<p>尾页</p>";
//      }
    }

    //统计信息
    protected function info(){
//      return "<p class='pageRemark'>共<b>" . $this->lastPage .
//          "</b>页 <b>" . $this->total . "</b>条数据</p>";
    }

    /**
     * 页码按钮
     * @return string
     */
    protected function getLinks()
    {

        $block = [
            'first'  => null,
            'slider' => null,
            'last'   => null
        ];

        $side   = 2;
//      $window = $side * 2;

		if($this->lastPage < 4){
			$block['first'] = $this->getUrlRange(1, $this->lastPage);
		}else{
			if(($this->currentPage + $side)>=$this->lastPage){
				if(($this->currentPage - $side) <= $side){
					$block['first'] = $this->getUrlRange(1, $this->lastPage);
				}else{
					$block['first'] = $this->getUrlRange(1,1);
					$block['last']   = $this->getUrlRange($this->currentPage - $side, $this->lastPage);
				}			
			}else{
				if($this->currentPage > (2 + $side)){
					$block['first'] = $this->getUrlRange(1, 1);
					$block['slider'] = $this->getUrlRange($this->currentPage - $side, $this->currentPage + $side);
					$block['last']  = [];
				}else{
					$block['first'] = $this->getUrlRange(1, $this->currentPage + $side);
					$block['last']  = [];
				}
				
			}
		}

//      if ($this->lastPage < $window - 1) {
//          $block['first'] = $this->getUrlRange(1, $this->lastPage);
//      } elseif ($this->currentPage <= $window) {
//          $block['first'] = $this->getUrlRange(1, $window - 1);
////          $block['last']  = $this->getUrlRange($this->lastPage , $this->lastPage);
//			$block['last']  = [];
//      } elseif ($this->currentPage > ($this->lastPage - $window)) {
//          $block['first'] = $this->getUrlRange(1, 1);
//          $block['last']  = $this->getUrlRange($this->lastPage - ($window - 1), $this->lastPage);
//      } else {
//          $block['first']  = $this->getUrlRange(1, 1);
//          $block['slider'] = $this->getUrlRange($this->currentPage - $side, $this->currentPage + $side);
//          $block['last']   = $this->getUrlRange($this->lastPage, $this->lastPage);
//      }

        $html = '';

        if (is_array($block['first'])) {
            $html .= $this->getUrlLinks($block['first']);
        }

        if (is_array($block['slider'])) {
            $html .= $this->getDots();
            $html .= $this->getUrlLinks($block['slider']);
        }

        if (is_array($block['last'])) {
            $html .= $this->getDots();
            $html .= $this->getUrlLinks($block['last']);
        }

        return $html;
    }

    /**
     * 渲染分页html
     * @return mixed
     */
    public function render()
    {
        if ($this->hasPages()) {
            if ($this->simple) {
                return sprintf(
                    '%s<div class="pagination">%s %s %s</div>',
                    $this->css(),
                    $this->prev(),
                    $this->getLinks(),
                    $this->next()
                );
            } else {
                return sprintf(
                    '%s<div class="pagination">%s %s %s %s %s %s</div>',
                    $this->css(),
                    $this->home(),
                    $this->prev(),
                    $this->getLinks(),
                    $this->next(),
                    $this->last(),
                    $this->info()
                );
            }
        }
    }

    /**
     * 生成一个可点击的按钮
     *
     * @param  string $url
     * @param  int    $page
     * @return string
     */
    protected function getAvailablePageWrapper($url, $page)
    {
        return '<a href="' . htmlentities($url) . '" title="第'. $page .'页 ">' . $page . '</a>';
    }

    /**
     * 生成一个禁用的按钮
     *
     * @param  string $text
     * @return string
     */
    protected function getDisabledTextWrapper($text)
    {
        return '<p class="pageEllipsis">' . $text . '</p>';
    }

    /**
     * 生成一个激活的按钮
     *
     * @param  string $text
     * @return string
     */
    protected function getActivePageWrapper($text)
    {
        return '<a href="" class="cur">' . $text . '</a>';
    }

    /**
     * 生成省略号按钮
     *
     * @return string
     */
    protected function getDots()
    {
        return $this->getDisabledTextWrapper('...');
    }

    /**
     * 批量生成页码按钮.
     *
     * @param  array $urls
     * @return string
     */
    protected function getUrlLinks(array $urls)
    {
        $html = '';

        foreach ($urls as $page => $url) {
            $html .= $this->getPageLinkWrapper($url, $page);
        }

        return $html;
    }

    /**
     * 生成普通页码按钮
     *
     * @param  string $url
     * @param  int    $page
     * @return string
     */
    protected function getPageLinkWrapper($url, $page)
    {
        if ($page == $this->currentPage()) {
            return $this->getActivePageWrapper($page);
        }

        return $this->getAvailablePageWrapper($url, $page);
    }

    /**
     * 分页样式
     */
    protected function css(){
//      return '  <style type="text/css">
//          .pagination p{
//              margin:0;
//              cursor:pointer
//          }
//          .pagination{
//              height:40px;
//              padding:20px 0px;
//          }
//          .pagination a{
//              display:block;
//              float:left;
//              margin-right:10px;
//              padding:2px 12px;
//              height:24px;
//              border:1px #cccccc solid;
//              background:#fff;
//              text-decoration:none;
//              color:#808080;
//              font-size:12px;
//              line-height:24px;
//          }
//          .pagination a:hover{
//              color:#077ee3;
//              background: white;
//              border:1px #077ee3 solid;
//          }
//          .pagination a.cur{
//              border:none;
//              background:#077ee3;
//              color:#fff;
//          }
//          .pagination p{
//              float:left;
//              padding:2px 12px;
//              font-size:12px;
//              height:24px;
//              line-height:24px;
//              color:#bbb;
//              border:1px #ccc solid;
//              background:#fcfcfc;
//              margin-right:8px;
//          }
//          .pagination p.pageRemark{
//              border-style:none;
//              background:none;
//              margin-right:0px;
//              padding:4px 0px;
//              color:#666;
//          }
//          .pagination p.pageRemark b{
//              color:red;
//          }
//          .pagination p.pageEllipsis{
//              border-style:none;
//              background:none;
//              padding:4px 0px;
//              color:#808080;
//          }
//          .dates li {font-size: 14px;margin:20px 0}
//          .dates li span{float:right}
//      </style>';
    }
}